泌阳凹陷复杂断鼻构造样式解析

泌阳凹陷在区域性引张作用下形成了典型的伸展构造样式——被不同层次断层切割成的一系列复杂断鼻、断块。通过对不同地区复杂断鼻、断块构造特征的研究,总结出地堑和阶梯状两种断块群模式类型,并对其控油机制进行分析,指出继承性的鼻状构造不仅控制了泌阳凹陷油气聚集的方向,也控制着各区的油气富集程度;断层是复杂断鼻构造油气成藏的主要因素,既可成为油气运移的通道,又可阻挡油气的运移而聚集成藏。因此泌阳凹陷复杂断鼻构造具备形成大面积油气富集区的地质条件。

Analysis on Complex Fault Nose Structural Patterns in Biyang Depression

Typical extensional structural patterns, cut into a series of complex fault noses and fault blocks by faults of different levels, form under regional extension force in Biyang depression. Based on study of structural features of the complex fault noses and fault blocks in different areas, fault block group patterns are classified into graben and step types and their control on oil accumulation are analyzed. Inherited nose- like structures control not only the direction of hydrocarbon migration, but also the level of hydrocarbon enrichment. Faults are the main factor that control hydrocarbon accumulations and can act both as migration pathways and barriers of hydrocarbon. Therefore, the complex fault block groups in Biyang depression have the geological conditions to form large hydrocarbon enrichment areas.